package com.example.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.example.eduservice.entity.EduSubject;
import com.example.eduservice.entity.excel.SubjectData;
import com.example.eduservice.service.EduSubjectService;
import com.example.servicebase.exceptionhandler.GuliException;

/**
 * @author wlg
 * @create_time 2021-08-29 下午 20:30
 * @function
 */
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

   //因为SubjectExcelListener不能交给spring容器管理，需要自己new，因此在这里不能注入其他对象
    //不能在这里通过注入其他对象，来实现对数据库的操作，因此需要手动注入

     public EduSubjectService subjectService;

    public SubjectExcelListener() {
    }

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
       if(subjectData==null){
           throw new GuliException(20001,"文件数据为空");
       }

       //一行一行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if(existOneSubject==null){ //没有相同一级分类，进行添加，有则代表重复
             //把一级分类添加到数据库
            existOneSubject=new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(existOneSubject);

        }
        //获取一级分类id值
        String pid=existOneSubject.getId();

        //添加二级分类
        //判断二级分类是否重复
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjcetName(), pid);
        if(existTwoSubject==null){
            existTwoSubject=new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjcetName());//二级分类名称
            subjectService.save(existTwoSubject);

        }

    }

    //判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService subjectService,String name){
        QueryWrapper<EduSubject> wrapper=new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        EduSubject onSubject=subjectService.getOne(wrapper);
        return onSubject;
    }

    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper=new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject twoSubject=subjectService.getOne(wrapper);
        return twoSubject;
    }


    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
